The thickness of steel decking is typically designed by gage. Which of the follo

Question

The thickness of steel decking is typically designed by gage. Which of the following gages has the lightest thickness:

a)Gage 22

b)Gage 24

c)Gage 18

d)Gage 20

The most effective method to reduce lateral deflections due to wind in a steel structure is

a)increase column sizes

b)increase girder sizes

c)add braces parallel to the direction of the applied wind

d)add braces perpendicular to the direction of the applied wind

The calculated dead load deflection of a beam is 2.2 in. If the beam is cambered for only 75% of the dead load deflections, then after the deal load is applied, the beam will deflect by:

a)2.40 in

b)1.76 in

c).48 inch

d).55 in

Explanation / Answer

First answer is b)Gage 24 because higher gage means lower thickness

Second answer is c)Add braces parallel to the direction of wind because a braced frame in direction of wind increases the stiffness of the frame by a lot.

Third answer is d)0.55in . The solution is:

Dead load deflection = 2.2"

camber = 0.75x2.2 = 1.65"

deflection after camber = 2.2-1.65 = 0.55"

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